Dental surgical instrument



Jan. 2,1945. 3 MoNT ELlus 2,366,671

DENTAL SURGICAL INSTRUMENT Filed March 11, 1940 Patented Jan. 2, 1945 UNITED DENTAL SURGICAL INSTRUMENT George A. Montelius, Minneapolis, Application March 11, 1940, Serial No. 323,340

1 Claim. to]. 32-45) My present invention relates to improvements in surgical instruments and, more particularly, to dental-surgical instruments.

a The objects of this invention are, first, to provide a dental-surgical instrument having characteristics intended to facilitate and improve oral This instrudental-surgical service technique. ment has been designed to facilitate surgical removal of teeth roots, impacted teeth, andpathe ological conditions in human jaws and surrounding tissues, to reduce surgical trauma and there by produce and hasten the healing process so necessary in avoiding post-operative pains and complications, to shorten the period of time for completing an operation in hand, to releasethe operator of unnecessary stress and strainjand to permit the surgeon to divert his attention from holding the instrument and allowing him to concentrate his energies on the process of the operation. Second, to provide a surgical instrument having a shank and cutting blade that have definite relation to each other and to certain characteristics of the instrument handle. Third, to provide a novel handle for dentalsurgicalinstrument that affords a solid grip with no tendency to rotate in the hand during .use of the instrument, and that is substantially selfbalancing in the .operators hand, thus abolishing during strain and fatigue of the hand and wrist use. o

Fourth, to provide an instrument handle, the contour ofwhich complies with anatomic requirements of the hand, and also co-operates with the laws governing the sense of touch, where by when an operator picks up the instrument, he is instantly aware, without looking at the instrument, as to the position of the cutting blade or working part thereof. Fifth, to provide an instrument handle having opposing gripping surfaces for the operators hand, and which surfaces are formed by grooves and intervening ridges that substantially con form, on an enlarged scale, in shape and pattern to certain of the grooves and intervening ridges on the bulbs of the finger, the result of which tion consists of the novel construction and ar-- rangement of parts hereinafter described and defined in the claim.

the invention, like characters indicate like throughout the several views.

3 In the accompanying drawing, which illustrates parts Referring to the drawing: f i t t. Fig. 1 is a side elevation of the improved dentalsurgical instrument; and i Fig. 2 is a view in elevation of the instrument show-n'in Fig. 1 and looking at the same in the direction of the arrow indicated in Fig. 1;

The improved surgical instrument includes a handle 3 having a shank 4 provided at its outer end with a blade 5. The handle 3 is tapered from its outer to it inner end. In cross-section, twodiametricallyopposite surfaces 6 ofthe handle 3 are-on the arc of a circle having its axis atthe longitudinal central axis of the handle and the intervening two surfaces 1 are flat. A series of grooves 8 and intervening ridges 9 are formed in each fiat surface 1 of the handle 3 at the inner end portion thereof. These grooves 8 and ridges 9 in each series extend transversely oblique to the longitudinal axis of the handle 3. These Igrooves 8 are relatively wide and are curved in cross-section. A depression-like seat I 0 for the anterior tip of the palmar surface of the first finger of an operator is formed in each of the handle surfaces 6.

The shank 4 tapers from its inner to its outer end and is round in cross-section. This shank 4 is in angular deviation relative to the longitu dinal central axis of the handle 3. The longitudinal central axes of the handle 3 and the shank 4 intersect substantially at the inner end of said handle.

The blade 5 has a fiat face II and its body, between the longitudinal edges of said face, is round in cross-section. The longitudinal central axis of the blade 5 is in angular deviation relative to the longitudinal central axis of the shank 4 and extends in a reverse direction from the longitudinal central axis of the handle 3 from that of the longitudinal central axis of said shank.

, Longitudinal cutting edges l2 are provided at the longitudinal edges of the blade 5. These cutting edges IZ extend completely around the point of said blade, as indicated at I3. The flat face ll of the blade 5 is longitudinally concaveand one of the cutting edges l2, when looking at said face, is concave and the other thereof is convex. The round back 14 of the blade 5-affords an elevator for the cutting edges I2 when the handle 3 is turned about its longitudinal central axis. It is important to note that therounded point 13 of the blade 5 is substantially in line with the center axis of the handle 3.. The back l4 of the or other group thereof, and with his first finger in one of the depression-like seats I0. It will thus be seen that the operator ihasia secure and firm grip on the handle and due to 'the novel 1 ridges 9 and with his first finger on the opposing. y it contour, there is no tendency of the'rhandle to" rotate in his hand.

As heretofore stated, the oblique grooves 8 and ridgesgalthough on."aigreatlywenlarged:scale, substantially conform vkin shape and Ipattern :to certain of the groovespand rridges:onlthe bulbs of the finger, Withtheresult'ithat the -.operators hand vholding the .:ins'trum'ent-. vhas a 1 comfortable and 'easy feeling. Also as heretofore stated,- the znovel contour of the handle I, and the relative position of its cutting blade. Jor other --working part cooperates with the ilaws {governing the "sense of touch and thereby, when ;the operator picks :up an instrument-the is instantly aware, without looking 1 at :the instrument, 1 as to ithe position :of the cutting edge 'orrother' working part. wIn other words, ;by.-the'use1of:.,the improved instrument ta :habit is :formed and iwithout; thought, .the oper- :a'tor takes hold of the handle and holds the {instrument in the correct position in which it is to be used to perform a certain work.

What I claim is:

A surgical instrument having a handle and a blade secured thereto through a shank part, said handle having oppositely disposed flat sides with a plurality of grooves in said flat sides adjacent the shank end of the handle, said grooves being disposed in inclined relation to the longitudinal central .axisiof the handle; .thetshank part being zinclined in langu'lar relation to said longitudinal central axis of the handle, said shank part being oppositely inclined in relation to said axis as are the grooves in the handle, said blade being ontheend o'f the shank opposite the handle and .-in reverse angular inclination from said longitudinal central axis of the handle from that of the shankjthe -.point of the blade being substantially in .line with said longitudinal central axis obtaining a desirable balance of the instrument in the operativeipositioni'in the;:operaltorisc handgisaid shank and tblade :substantiall-y- :defining-ya 1131811519,

the blade having two-longitudinalltcdisposed:out-

,ting ledges:spaced:apart-substantially ;in:r'awplane substantially *rpfllpendicularato ithe mfirst :noted iplaneyone of said edgesibeingtlongitudinally ILQOII- vex eandlthe other of said edges being i longitudinally concave,'atheifaeeiof-zthe blade .beingdon- I gitudinal'ly concave, .the blade :and :the; groovesiin the:handlebeingrsubstantially parallel permitting a l proper orientation 20f .the point r and wcutting edges of :the rblade' byithetfeel1ofctheshandle: and grooves in the operatorszhand without th'eznecessity' of viewing the point and :cutting -.:edges:of. ithe GEORGE 4A. MONTIELIIISQ 

